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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:20:45                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              226/Tom Green                                             VRSN:      W
                                                        226-907/Grape Creek ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A               19,448,196        0.9770            19,906,035              20              677         .028329615
      2           A               19,410,095        1.0252            18,932,984              11              396         .003189065
      3           A               19,413,717        0.9941            19,528,938              15              292         .004304342
      4           A               19,341,209        1.0202            18,958,252              27              190         .004726069
      5           D3               8,405,602        0.9911             8,481,084              10            1,072         .000428392
      6           L1               1,464,934        0.9567             1,531,237               9               76         .005840827
      7           L1               1,536,917        0.9992             1,538,148               6               24         .003092281
      8           L1               1,696,103        0.9667             1,754,529               4                8         .020397054
  RANDOM TOTALS:                  90,716,773                          90,631,207             102            2,735
  CATG D1 EXCEPTION VALUES:        5,426,220                           5,064,386
  CATG L1 EXCEPTION VALUES:        1,902,237                           1,891,644
 TOTAL TEST VALUES (4):           98,045,230                          97,587,237
 MARGIN OF ERROR PERCENT:          5.0000002
 MARGIN OF ERROR VALUE:            4,879,362
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:             92,707,875 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:              98,045,230 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            102,466,599 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             102,704,940 (SEE ISD SUMMARY WORKSHEET)

 SOURCES:
 (1) SEE STRATIFIED CATEGORY WORKSHEET REPORTS PTS236, PTS430
 (2) NUMBER OF PARCELS SAMPLED BY STAFF
 (3) TOTAL CATEGORY PARCELS FROM STRATIFICATION REPORT APPRAISAL ROLL, OR SELF-REPORT
 (4) INCLUDES ANY PARCELS IN A, B, C, D3, F1, G1, G2,OR L1 MARKED AS EXCEPTION PROPERTIES
 (5) UNSTUDIED CATEGORIES AND SUB-CATEGORIES WERE NOT INCLUDED IN THE CONFIDENCE INTERVAL VALUES